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area.routing.94jul.txt
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1994-11-02
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Routing Area
Director:
o Joel Halpern: jhalpern@newbridge.com
Area Summary reported by Joel Halpern/Newbridge Networks
Corporation
Inter-Domain Multicast Routing Working Group (IDMR)
Changes to the PIM DM specification were discussed. A new IGMP message
type is introduced by PIM for reporting the RP: an IGMP-RP-report is
sent in response to IGMP host membership queries.
PIM assert messages, which are sent by PIM routers on multi-access LANs,
now carry a metric. The purpose of the metric is to override the
possibility of a non-optimal path being chosen.
PIM DM-SM interaction was discussed in some detail. It is a goal of PIM
that a router's interfaces should be configurable individually in DM or
SM. How particular interfaces are configured will depend upon the
operational environment.
PIM scalability was discussed and analyzed in detail, and various
intuitive conclusions were drawn as to how PIM is likely to scale when
operating over the wide-area.
Administrative scoping of IP multicast was explained, the purpose of
which is address re-use, and to allow the more effective containment of
`scoped' multicasts.
Finally, a multicast ``traceroute'' protocol was described in some
detail.
Inter-Domain Routing Working Group (IDR)
The IDR Working Group is the result of a merge between the Border
Gateway Protocol Working Group (BGP) and the OSI IDRP for IP Over IP
Working Group (IPIDRP). BGP and IPIDRP held a joint session in Toronto.
The group discussed (a) a new working group charter, (b) the status of
BGP4, (c) the BGP/OSPF Interaction document, (d) AS space growth, (e)
IDRP implementation, (f) inter-domain routing for IP6, and (g)
deprecation of EGP. The group feels that EGP should be moved to Historic
status.
IP Routing for Wireless/Mobile Hosts Working Group (MOBILEIP)
The meeting reviewed the design and outstanding issues relative to the
current Internet-Draft. All of the outstanding issues were resolved. A
number of items were raised for further discussion. It is hoped that
the group will have a solid proposal and consensus to advance the draft
to Proposed Standard after the next IETF meeting.
IS-IS for IP Internets Working Group (ISIS)
Doug Montgomery presented the documents related to pushing I.IS-IS to
Draft Standard. It is suggested that the MIB go to Proposed Standard,
and I.IS-IS (``son of RFC 1195'') go to Draft Standard. The protocol
experience and protocol analysis needs to be issued as Informational
RFCs. An applicability statement is also needed.
The status of the IS-IS/IDRP-BGP interaction is unknown. This should be
published as an Internet-Draft and/or RFC.
Some minor changes to I.IS-IS have been added. All changes are
interoperable with the previous version. Those which are appropriate
will be forwarded to ISO. There have also been some minor changes to the
MIB configuration options, as well as clarification for cases where
configuration and computation differ.
A number of minor clarifications were added based on implementation
experience. There were a few places where implementors had
misinterpreted the specification, so these were tightened up.
New Internet Routing and Addressing Architecture Working Group
(NIMROD)
The NIMROD Working Group met as a BOF in Toronto.
The group had presentations and reviews of the changes to the
``architecture'' draft, Martha Steenstrup's ``functionality''
Internet-Draft, and S. Ramanathan's Internet-Draft on NIMROD's approach
to mobility and multicast. There was discussion on how to approach
specifying the database and protocols.
The group still has not completely converged to where attributes belong.
Isidro Castineyra will be sending a message to the list enumerating the
approaches and comparing them.
There is a question of how to organize the database. A suggestion was
made to use MIB format. This was not enthusiastically received. Isidro
will be sending a message to the list sketching the requirements of the
database and its contents.
Open Shortest Path First IGP Working Group (OSPF)
Half the meeting was spent discussing the ``OSPF over demand circuits''
Internet-Draft, which proposes enhancements to OSPF enabling efficient
operation over dial-up circuits. Fred Baker then presented an MD5
authentication scheme for OSPF, and clarified his point-to-multipoint
interface for OSPF; it was decided that both of these new functions
would be folded into the base OSPF specification. Three small technical
changes to OSPF were then discussed, and the working group decided on
the disposition of the 12 RFCs and Internet-Drafts that fall under its
jurisdiction (see minutes for details). The meeting ended by soliciting
people to work on the OSPF for IPng specification (Fred Baker and Dennis
Ferguson volunteered).
RIP Version II Working Group (RIPV2)
After a quick approval of the current documents for advancement on the
standards track, the group concentrated on three issues: usage of the
next hop field, Jeff Honig's ``infinity equals 15'' problem and MD5
authentication.
After much discussion and hand-waving, the group decided that the usage
of the Next Hop field, as described in the applicability statement, is
an unusual, but valid, use of the field. It was pointed out that
implementors should probably have a switch to control use of the field
in the manner described.
There was concern expressed about ambiguity in the way routes with
metric 14 and 15 were processed. The group decided that nothing needed
to be done about this.
A proposal for adding MD5 authentication to RIP-2 was made. This
proposal will be documented separately from the RIP-2 specification, and
advance on its own. The MIB elements needed to support the proposal are
already in place.
Routing Over Large Clouds Working Group (ROLC)
The chair led a discussion of the working group goals and problem
statement, based upon the charter and prior working group meetings.
There was general consensus on these. Certain additional issues about
more closely integrating the switching and routing layers were raised.
The group felt that was not the problem to be worked on in this group.
There was a review of the requirements and goals as produced by the
Seattle brainstorming. There was consensus in support of those
requirements and goals, with minor improvements.
Following this portion of the meeting, Dave Katz led a discussion of his
current Next Hop Resolution Protocol draft. He went though the draft
and discussed the purpose of the various PDU types, illustrated some
protocol scenarios and answered questions. He received a number of
suggestions from the working group for improving both the protocol and
its description in his draft.
The agreed goal of the working group is to have a new draft well before
the next meeting. E-mail discussion should lead to agreement at the
meeting to advance the document to Proposed Standard.
Source Demand Routing Working Group (SDR)
The working group began with a status report of the progress since the
previous IETF. Activity has been focused mainly at USC/ISI and Merit on
the development of practical route construction mechanisms. USC
reported minimal progress since the last IETF, but Sue Hares of Merit
gave a presentation on mechanisms for IDRP RIB Query in support of SDRP
route construction. These mechanisms provide an ability to get a full
RIB dump, and ongoing updates to the RIB, as well as a partial one-time
dump of portions of the RIB. Deborah Estrin gave a short presentation on
the use of ``path explorers,'' an alternative route construction
mechanism. Estrin also reported on the increasing interest in SDRP-like
mechanisms to support routing for reservation-oriented traffic (see the
minutes of the RSVP Working Group meeting).
The working group then went to a joint session with the SIPP Working
Group, where SDR for IPv6 was discussed. After some interesting
discussion, it was decided that SDR for IPv6 is indeed of interest and
that this work should continue in the SDR Working Group.